Microwave-Plasma-Coupled Re-Ignition of Methane-and-Oxygen Mixture Under Auto-Ignition Temperature

作者：Rao Xing^*; Hammack Stephen; Carter Campbell; Grotjohn Timothy; Asmussen Jes Jr; Lee Tonghun

来源：IEEE Transactions on Plasma Science, 2011, 39(12): 3307-3313.

DOI：10.1109/TPS.2011.2161597

• Auto-ignition temperature
• laser induced fluorescence
• plasma assisted combustion
• re-ignition

The re-ignition phenomenon is observed when fuel/oxidizer is re-introduced into an atmospheric-pressure plasma discharge generated by cutting off the gas flow in a re-entrant microwave-plasma applicator system used for plasma-assisted ignition and combustion research works. Results indicate that, for re-ignition to occur, the electric field must be strong enough to fully establish a weakly ionized and self-sustained plasma discharge, and with elevated radical concentrations. The re-ignition was possible at gas flow speeds higher than typical flame propagation rates, and temperature measurements (thermocouple and N(2) emission) reveal that re-ignition occurs under auto-ignition temperatures. The high-speed imaging of the flame propagation shows that it is a two step process of initiating a fast pyrolysis flame, which, in turn, stabilizes and starts the direct coupling process of the plasma energy into the flame for full re-ignition to occur.

• 出版日期2011-12